Are immigrants not allowed to leave the country after staying there for two years?

No. These two years can be two consecutive years or two cumulative years

The Immigration Bureau’s legal requirement of “at least two years of residence within five years” does not start from the time of immigration landing. , it is not calculated from the time when you get the Maple Leaf Card. Its algorithm has two forms:

1. Count back five years from the day when you submit the Maple Leaf Card extension application and live for two years.

2. From the time of each entry into Canada, work backwards within five years to stay for two years.